chore: pin CI to use protoc-gen-openapi PR #13 commit

Update both ci.yml and bootstrap.sh to use the modified protoc-gen-openapi
that supports reading the custom fern.summary option from proto files.

This allows the grpc-comments test to pass with the custom summary
'Add a Comment' instead of the auto-generated 'Create Comment'.

Once fern-api/protoc-gen-openapi#13 is merged and
released, these should be updated to use @latest or a tagged release.

Co-Authored-By: kenny@buildwithfern.com <kenny@buildwithfern.com>

Author: devin-ai-integration[bot]

.github/workflows/ci.yml

@@ -101,7 +101,7 @@ jobs:
           cache-dependency-path: generators/go/go.sum
 
       - name: Install protoc-gen-openapi
-        run: go install github.com/fern-api/protoc-gen-openapi/cmd/protoc-gen-openapi@latest
+        run: go install github.com/fern-api/protoc-gen-openapi/cmd/protoc-gen-openapi@1aa7fe870834ed27024dc44afd95648a0d63ec57
 
       - name: Run tests
         run: pnpm test
@@ -130,7 +130,7 @@ jobs:
           cache-dependency-path: generators/go/go.sum
 
       - name: Install protoc-gen-openapi
-        run: go install github.com/fern-api/protoc-gen-openapi/cmd/protoc-gen-openapi@latest
+        run: go install github.com/fern-api/protoc-gen-openapi/cmd/protoc-gen-openapi@1aa7fe870834ed27024dc44afd95648a0d63ec57
 
       - name: Run ETE tests
         env: